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That just seems counter-intuitive to me. Why not candle, and not take the risk of drowning a viable egg?
Oh well... whatever's easiest and works. I guess I've never seen a hen candle an egg either...
There are many eggs you can not candle, either the shell is to dark or thick to see anything.
I personally let my eggs sit until they are 3 days late. The ones I can candle I do, its quick and easy.
The ones I can not candle (quail eggs are all but impossible to see and I also have Maran's) I float test to see if they are still alive. They do not drown as the egg floats if it has a proper air cell. If I see movement I pull the egg and put back in the incubator then check the others.
If not for the float testing I'd have tossed a few live growing chicks.
But I do not float until they are 3 days late. (3 days after last chick hatched or if no hatch 3 days after due date.)
I raise Marans, too, and candle them just fine. Just takes the right light.
Haven't found an egg I can't see into yet. I just don't toss eggs until I know for sure there's no movement.